Post by rapidjim on Nov 9, 2014 9:51:39 GMT -6
I got an interesting phone conversation last week concerning a customer doing his own valve adjust. After he adjusted his valves, he told me his 300 trike would turn over really fast but would not start. He said he went back and checked it again, with the same results and wanted to know what I thought. He told me how he adjusted the valves and it was the correct proceedure and gap. I asked him if he could do a compression check and he said he didn't have the correct adapter for his gauges and wondered if I would take a look. About an hour later, he showed up with his Magnum on a trailer. We unloaded it and bought it in the shop. When I attempted it start it I could tell by the way it was turning over that there was zero compression. So I did a leak down test and had air coming out of the carb, hmmm did he clip the intake valve? As I was removing the intake valve cover, to inspect the rocker, I heard a snap noise. Didn't really pay to much attention to it at that moment. Checked the lash and it was correct. Rotated the motor to watch the rocker movement and at this time we had compression. I removed the leak down tester and verified compression. Now I am puzzled. Look into the intake valve side with a flash light and didn't see any junk inside. As I picked up the valve cover, it slipped out of my hand, when I picked it up this is what I saw
It appears that the oil deflection flashing was holding the intake valve slightly open. Unlike the exhaust valve cover which has 3 bolt holes and can only go on one way, the intake valve cover has 2 bolt holes and will fit either way. I have not had this happen before, and never looked at the valve cover, must have been lucky each time or maybe this is only this way on the newer motors.
Whatever the case, I thought it would be worthwhile to make a post so it don't happen to others. Or if it does they know what to do.
It appears that the oil deflection flashing was holding the intake valve slightly open. Unlike the exhaust valve cover which has 3 bolt holes and can only go on one way, the intake valve cover has 2 bolt holes and will fit either way. I have not had this happen before, and never looked at the valve cover, must have been lucky each time or maybe this is only this way on the newer motors.
Whatever the case, I thought it would be worthwhile to make a post so it don't happen to others. Or if it does they know what to do.
..BAD TO THE BONE..
